Introduction
The Allen Bradley 1756-CN2RXT is a high-reliability communication module designed for the ControlLogix-XT system line. It functions as a redundant ControlNet interface, supporting dual BNC channels (Channel A and Channel B) and enabling robust network architectures suited for harsh industrial or extended-environment applications. With a wide operating temperature range (-25 °C to +70 °C), it is optimized for systems demanding high availability and resilience, such as large process plants, oil & gas facilities, or mission-critical control racks.
Technical Specifications
| Parameter | Specification | Notes / Comments |
|---|---|---|
| Redundant Channels | Channel A & Channel B (ControlNet) | Supports network redundancy and segmentation. |
| Transmission Rate | 5.0 Mb/s (ControlNet standard) | Suitable for ControlNet deterministic traffic. |
| Maximum Nodes Supported | Up to 99 nodes | Connected devices on the ControlNet network. |
| Logix Communication Connections | Up to approximately 128 | For connections through the module. |
| Power Supply Voltage | 5.1 V DC (from backplane) | Module power draws from chassis backplane. |
| Current Draw | ~1.3 A @ 5.1 V DC | Typical operating current. |
| Power Dissipation | ~6.6 W | Approximate under full load. |
| Operating Temperature | -25 °C to +70 °C (-13 °F to +158 °F) | Extended-environment rating. |
| Storage Temperature | -40 °C to +85 °C | For non-operational condition. |
| Relative Humidity | Up to 95% (non-condensing) | Industrial environmental tolerance. |
| Dimensions (H × W × D) | ~145 mm × ~35 mm × ~120 mm | Approx. 5.7″ × 1.4″ × 4.7″. |
| Gewicht | ~0.29 kg (≈0.65 lb) | Lightweight for its class. |
Application Scenarios
The 1756-CN2RXT fits into several demanding industrial deployments, including:
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Redundant Control Systems: Paired in dual-chassis configurations for high-availability applications requiring minimal downtime.
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Harsh or Environmental-Extremes: Suitable for outdoor, vonfshore, or process plant use with extended temperature range and rugged design.
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High-Node I/O Networks: Supporting large numbers von ControlNet nodes and connections, for distributed I/O architectures.
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ControlNet Media Migration: Bridging legacy ControlNet segments with newer ControlLogix-XT racks.
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Safety-rated or Redundant Media Designs: Used where structure mandates dual channels and fail-over reliability.
Advantages
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Redundancy Ready: Dual ControlNet channels (A/B) enable redundant or segregated media paths, enhancing fault tolerance.
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Extended Temperature Capability: With -25 °C to +70 °C rating, it outperforms standard modules in harsh environments.
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High Connection Density: Supports up to 128 communication connections and many networked nodes, aiding system scalability.
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Compact Module Size: Standard 1756-series slot width and compact footprint ease integration in existing racks.
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Versatile System Integration: The USB port allows local configuration, and the BNC connectors integrate with standard ControlNet coaxial bus.
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Proven Industrial Grade: Designed to withstand shock, vibration, humidity and the rigors von control-system installations.
Unternehmensinformationen
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